Earlier quoted context omitted.
Following your logic, China is better off because instead of having one party protesting but failing to reject a law promoted by the elections-winning other party, it's just better to have one single party control everything. Sorry but I find this just mindblowing.
The parent comment is saying that the economic success of China should be encouraging America to step it's game up, not that it should become a single party system.
Since when people just want to live comfortable lives and leave their collective fate to be decided by a minority whose interests do not necessarily align with the people's interests (otherwise, they would just allow fair elections).
Small example: of course, country-wide surveillance à la China would lead to "economic success", do you think it's criticized because it would lead to mass poverty ?
It would lead to a perfectly stable future for the population, with ever improving quality of life and security. The problem, as you may guess, lies elsewhere.